JPH0611945B2 - Conductive makeup sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention provides a conductive decorative sheet suitable for a floor material of a factory handling electronic parts such as IC and LSI.

(Prior art and its problems) Conventionally, in order to avoid the occurrence of electrostatic damage as much as possible, a publicly known plastic or rubber floor material filled with a large amount of conductive carbon black has been used in an operating room or a computer room.

However, even though these floor materials have an anti-static effect, the surface of the floor material is black, and the design of the interior material is low.

In order to solve this problem, the interior material described in JP-B-60-6429 was obtained. This interior material is a flooring material composed of non-conductive colored pellets and conductive pellets and has a design property,
And it shows a considerable antistatic effect. However, if this floor material is used in an electronic parts factory that handles ICs, LSIs, etc., for example, the Honest meter method is 300V for 10KV.
The above voltage was applied, and the voltage breakdown of the electronic component occurred.
This voltage breakdown is, for example, when the human body is used as a capacitor, the electricity accumulated in the human body flows out to the electronic parts and destroys the electronic parts.

This voltage breakdown always occurs when the charged voltage is 100 V or more,
50V or less, more preferably 30V or less. However, in the above-mentioned known floor material, the electricity charged in the non-conductive chip is not easily removed, so that the voltage breakdown is induced.

(Means for Solving Problems) The present invention is a decorative material having excellent conductivity as well as design, a synthetic resin chip containing conductive carbon black, and transparent or light-colored vinyl chloride capable of desired coloring. A polymer resin and a butadiene-acrylonitrile copolymer mixture or a synthetic resin chip containing a conductive material consisting of phthaldiene-acrylonitrile-vinyl chloride terpolymer and containing no conductive carbon black has a layer integrated under heat and pressure. The main point is a conductive decorative sheet. A description will be given below with reference to the drawings.

1 is a sectional view of the decorative material of the present invention. FIG. 2 is a partially enlarged view of the surface layer of FIG.

Reference numeral 1 denotes a conductive base material, which is preferably a sheet obtained by kneading conductive carbon black or the like with PVC, and is lined with a floor material.

Reference numeral 2 denotes a synthetic resin chip such as PVC containing conductive carbon black (hereinafter referred to as a black chip) 5 to 5 of the resin composition.
It is a chip added with 20% by weight.

3 is a synthetic resin chip (hereinafter referred to as a white chip) that contains a transparent or light colored conductive material and does not contain conductive carbon black. It is desirable that the conductive material is contained in an amount of 20 to 90% by weight of the synthetic resin composition, and the white chip can be colored in a desired color.

The black chips 2 and the white chips 3 are formed into a chip by adding a colorant or carbon black to the composition and kneading into a kneading sheet.

It is desirable that both black and white chips have a particle size of 0.5 to 5 mm.

As shown in FIG. 2, the decoration material in the present invention is a white chip 3 in which a black chip 2 and a transparent or white conductive material 4 are mixed and filled, and preferably, the black chip 2 is 2 to 2 of the whole decorative sheet of the present invention. 30% compounded and integrally molded. As the conductive material 4, a tin compound such as tin oxide, an indium compound, a conductive metal titanate, copper iodide, a metal oxide such as zinc oxide is used, but a polyvinyl chloride (PVC) polymer. And a butadiene (BD) -acrylonitrile (AN) -based copolymer mixture, the same graft copolymer or BD-AN-vinyl chloride terpolymer. Further, a conductive polymer such as a PVC-polyurethane graft copolymer or a styrene-diene-pyrrole-based terpolymer is also suitable. Especially PVC-based polymers and BD-A
Mixtures of N-based copolymers are preferably PVC / BD-A
N has a weight ratio of 95/5 to 20/80. Further, the conductive material is added to cresyl diphenyl ester phosphate,
10 ⁸ Ω-cm volume resistance of phosphoric acid tricresyl ester, phosphoric acid dioctyl ester, phosphoric acid triamyl ester, phosphoric acid (2-butoxyethyl), phosphoric acid (2-chloroethyl) ester, etc. It is obtained by adding the conductive plasticizer of.

By adding the conductive material 4, the volume resistance value is 9.
Good conductivity is obtained without exceeding 0 × 10 ⁸ Ω-cm.

An electrolyte such as lithium chloride, sodium chloride or magnesium chloride may be added to the conductive material of the present invention.

Black chip 2 and white chip 3 are mixed and 160-220 ℃
Then, it is heated and pressed to 1 to 5 mm and integrated. The black chips and the white chips 3 may be randomly mixed or may be divided into patterns.

Thus, the floor material of FIG. 1 having a through pattern and a thickness is obtained. The floor material 5 has a configuration in which the black chips 2 are dispersed in the colored white chips 3, and the black chips serve as an accent, and a floor material with a design property is obtained.

Further, in the present invention, since the white chip and the black chip each having conductivity are integrated, it is easy to dissipate the electric charge, and remarkable conductivity is obtained as the entire flooring material. The electrification voltage requirement of the floor material due to walking in an electronic parts handling factory is 50 V or less, preferably 30 V or less, whereas the decorative sheet of the present invention shows a marvelous performance of 20 V or less and the voltage in the factory handling IC, LSI, etc. It is used as a flooring material that eliminates destruction accidents.

The decorative sheet conductive material of the present invention is used as a conductive flooring material by laminating a backing material, and it itself exhibits good conductivity.

(Effect of the invention) 1. A black-and-white conductive chip was interposed in a colored conductive chip of a desired color, and the black chip served as an accent to obtain excellent designability.

2. Even with the Honest meter method, a charged voltage of only about 8V per 10KV was generated, and the voltage of the human body was low, which prevented a voltage breakdown accident.

3. Whereas the conventional antistatic treatment was largely dependent on humidity, the decorative material of the present invention provided excellent conductivity performance independent of humidity.

4. The decorative material of the present invention exhibits excellent conductive performance not only when the conductive backing material is laminated, but also without the above backing material.

Example (Example 1) The dark green, green, and light green sheets of formulation A were crushed to obtain colored conductive synthetic resin chips (white chips) having a particle size of 0.5 to 5.0 mm.

On the other hand, the sheet of formulation B was similarly pulverized to obtain a synthetic resin chip (black chip) containing conductive carbon black.

(Formulation A) Mixture of vinyl chloride resin and acrylonitrile-butadiene copolymer 100 PH
R D O P 28 〃
Conductive plasticizer * 5 〃
Calcium carbonate 18〃
Stabilizer 2〃
Facial fee 5〃
* Phosphate ester plasticizer (formulation B) vinyl chloride 100 PH
R D O P 70 〃
Calcium carbonate 170〃
Stabilizer 7 〃
Conductive carbon black 30 〃
A conductive backing material obtained from the same composition as a black chip by mixing a black chip to a white chip having a mixing ratio of dark green, green and light green of 1: 1: 1 so that the mixing ratio is 10%. After forming the upper layer, it was heated and pressure-integrated at 160 ° C. to obtain a floor material of the decorative sheet of the present invention.

Comparative Example A flooring material similar to that of the example 1 was obtained by using the chip of the formulation C obtained by removing the conductive resin and the conductive plasticizer from the white chip of the example 1.

(Example 2) A conductive flooring material was obtained in the same manner as in Example 1 except that BD-AN-vinyl chloride terpolymer was used as the conductive material of the white chips.

(Compound C) Vinyl chloride monovinyl acetate copolymer resin 100 PHR Plasticizer 33 〃 Stabilizer 2 〃 Calcium carbonate 18 〃 Facial agent 5 〃 The floor materials of the obtained Examples and Comparative Examples are (1) Honest Charge voltage of floor material by meter method (according to JIS L 1094) (2) Human body voltage by walking (according to JIS L 1021) (3) NFPA method (electrical resistance between ground surface and ground) was measured .

All measurement conditions were 20 ° C. and 20% relative humidity.

The results are shown in Table 1.

As shown in the columns of Example 1 and Example 2 in Table 1, the decorative sheet of the present invention showed excellent conductive performance and no voltage breakdown occurred.

On the other hand, the comparative example caused voltage breakdown.

[Brief description of drawings]

FIG. 1 is a sectional view of the decorative sheet of the present invention, and FIG. 2 is a partially enlarged view of FIG. Reference numeral 2 is a synthetic resin chip containing conductive carbon black, and 3 is a colored conductive chip containing no conductive carbon black.

Continuation of front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location H05F 1/00 7028-5G H05K 9/00 7128-4E

Claims (1)

[Claims] 1. A conductive resin chip comprising a conductive carbon black, and a light-colored vinyl chloride polymer and a butadiene-acrylonitrile copolymer mixture or a butadiene-acrylonitrile-vinyl chloride terpolymer capable of being transparent or colored as desired. A conductive decorative sheet having a layer in which a synthetic resin chip containing a conductive material and containing no conductive carbon black is integrated under heating and pressure.